authored by
Yuki Izumi
<yuki@kivikakk.ee>
10 years ago
TODO
| 1 -
qb.c
| 18 ++++++++++++++++--
2 files changed, 16 insertions(+), 3 deletions(-)
@@ -1,5 +1,4 @@
* model a text editor
- * horizontal scrolling
* virtual space
* considerations for backspace/delete in virtual space
* model the application GUI
@@ -46,6 +46,13 @@ static SDL_Keycode shift_table[][2] = {
{SDLK_EQUALS, SDLK_PLUS},
};
+static int min(int a, int b) {
+ if (a < b) {
+ return a;
+ }
+ return b;
+}
+
static doc_line_t *create_doc_line(void) {
doc_line_t *d = malloc(sizeof(*d));
memset(d, 0, sizeof(*d));
@@ -269,8 +276,8 @@ void render(void) {
for (int y = 0; y < scroll_y && line; ++y, line = line->next) {}
for (int y = 0; y < 21 && line; ++y, line = line->next) {
- for (int x = 0; x < line->stored; ++x) {
- screen[(y + 2) * 80 + 1 + x] += line->line[x];
+ for (int x = scroll_x; x < min(line->stored, 78 + scroll_x); ++x) {
+ screen[(y + 2) * 80 + 1 + x - scroll_x] += line->line[x];
}
}
@@ -354,6 +361,13 @@ static void check_scroll(void) {
} else if (cursor_y > scroll_y + 20) {
scroll_y = cursor_y - 20;
}
+
+ /* window width: 78 characters (1 to 78) */
+ if (cursor_x < scroll_x) {
+ scroll_x = cursor_x;
+ } else if (cursor_x > scroll_x + 77) {
+ scroll_x = cursor_x - 77;
+ }
}
void qb_init(void) {
